J.P. Instruments EDM 740 Pilots Guide - Manual (Page 59)

For Your Safe Flight Page 59
Fuel Data input to GPS (an output from the EDM)
RS-232 Serial data format: 8 bit data, 1 start bit, no parity. Baud
rate: 9,600.
EDM Output format is normally fixed by the GPS-C number you
chose, but may be over-ridden when the EDM auto-senses certain
incoming GPS navigation formats. For example, if the EDM senses
Northstar or NMEA-183 navigation data formats coming in, the
EDM will not send fuel data to the GPS.
Section 13 - Options Connector Pin Assignments
P1 25-pin connector for 4 or
6 cylinder engines. See
installation manual for 7, 8, 9
cylinder instruments P3 MAP-RPM
9-pin connector P4 Fuel Flow Option
15-pin connector
Pin
no.
Pin
no.
Probe or
function
Pin
no.
Function/
sensor pin
Pin
no.
Function
yel 1 red 2 Oil Temp grn 1 RPM sig /1 1 RS-232 out
yel 3 red 4 IAT blk 2 RPM grd /2 2 RS-232 in
yel 5 red 6 CRB/CDT red 3 RPM pwr /3 wht 4 FF signal
yel 14 red 15 OAT red 4 MAP pwr /3 red 5 FF power
yel 16 red 17 TIT blk 5 MAP grd /1 blk 6 FF return
yel 18 red 19 TIT2 wht 6 Oil P term 7 Switch com
gry 12 Remote
alarm
blk 7 Oil P term 8 Switch EGT
red 13 + Power
14/28 vdc wht 8 MAP sig+ /2 9 Switch FF
wht 24 RS-232
data port
grn 9 MAP sig- /4 11 Remote FF
alarm
blk 25 Ground at
Engine
Interface connections to selected GPS models
EDM Fuel flow conn Pin 1 Fuel flow conn Pin 2
Arnav 5000 Pin 4 Pin 5
Garmin 195 (nc) Pin 4
Garmin 430 / 530 Pin 57 Pin 56
Northstar M3P (nc) Pin 6 (leave pin 11 open)
UPS GX50 / 60 Pin 4 Pin 5